Transmission



0, 1929. s. A. JEFFRIES 1,725,142

TRANSMISS ION Filed Dec. 22, 1924 2 Sheets-Sheet l INVENTOR. 56% Z ef/irfe/frzgs /A 5mm 1- 6M ATTORNEY Aug. 20, 1929. s. A. JEFFRIES TRANSMI SS ION 1 2 m w M M H r m k s 2 W M M w 5 W Filed Dec. 5 2, 1924 abmmqaPatented Aug. 20, 1929.

UNITED STATES PATENT OFFICE.

SCHUYLER A. JEFFRIES, OF LANSING, MICHIGAN, 'ASSIGNOB TO REO MOTOR CABCOMPANY, OF LANSING, MICHIGAN, A CORPORATION OF MICHIGAN.

TRANSMISSION.

Application tiled December 22, 1924. Serial No. 757,517.

The invention relates to transmission mechanisms adaptable for use inmotor vehicles. The object is to provide a mechanism of the selectivegear type having a series of forward and reverse speeds of dif". ferentratio. 1

The invention consists in the novel arrangements and combinations ofparts as hereinafter more fully described.

In the drawings:

Figure 1 is a longitudinal section through the transmission;

Figure 2 is a transverse line 22 of Figure 1; and

Figure 3 is another transverse section taken on the line 33 of Figure 1.

My improved transmission is provided with four forward speeds ofdifferent ratios and two reverse speeds and is'composed essentially oftwo units, A and B, the first unit containing an arrangement permittingeither a direct drive or a forward drive at reduced-speed and the secondunit being arranged to provide a direct connection, a forward gear driveand a reverse gear drive. The unit B is preferably controlled by onecontrol lever while unit A g is actuated through a separate controllever. Both units are preferably mounted in a transmission case and soarranged as to constitute a single transmission mechanism having adriving shaft at one end thereof and a driven shaft at the other end.

The transmission case 1 is referably made up in two pieces, the rearousing 2 and the forward housing 3. At the forward end of the rearhousing there is an inwardly projecting portion of the casing designatedas 4 in which is inserted a bushing 5 for receiving the annular rollerbearings 6 and 7 respectivel these bearings supporting the centralrotatable member 8. The member 8 is provided at its forward end with aradial flange 9 having the longitudinally projecting annular flange 10connected thereto, the latter being provided with internal gear teeth11. The member 8 also has formed thereon preferably intermediate thebearings 6 and 7, the external gear teeth 12 and at its rear end isprovidedwith the internal clutch teeth 13.

section on the 14 is the driving shaft of the transmission tendingthrough the forward housing 3 and having the rear end thereof journaledin the roller bearings 16 arranged in the hollow interior of vtherotatable member 8. 17 is the driven shaft journaled in the ballbearings 18 in the rear of the transmission case I and extending throughthe rear housing 2 in axial alignment with the driving shaft 14 andhaving its forward end journaled 1n the-roller bearings 19 also arrangedwithlijn tlge hollow interior of the rotatable mem- The driving shaft 14has external teeth 20 thereon forming a drive pinion 21 and on each sidethere are the roller bearings 22 and 23 respectively for rotatablymounting the member 24 which has formed thereon the eccentric 25. Themember 24 is preferably made up of two parts 26 and 27 secured togetherby the screws 28 and 29, the latter serving also to secure acounterweight 30 to the member 24 in such a position to balance theweight of the eccentric portion 25. 31 is the eccentric gear rotatablymounted on the eccentric portion of the member 24 by the roller bearings32 and 33 and having formed on its inner periphery the internal gearteeth 34 and having also the external gear teeth 35. The internal teethof the eccentric gear 31 mesh with the teeth 20 of the pinion 21 whilethe external teeth 35 are arranged to mesh with the internal teeth 11 ofthe annular flange 10 at a point diametricall o posite from the point ofmeshing with tiie internal teeth 34. Thus, if the eccentric member 24 isheld from rotative movement the driving of the pinion 21 will rotate theannular flange 11 at reduced speed through the eccentric gear 31. J

On the periphery of the eccentric member 24 there are arranged atopposite ends thereof the clutch teeth 36 and 37, the former beingpreferably formed integral with the end flange 26 and the latterintegral with the other end flange 27. The teeth 37 are adapted to meshwith the internal teeth 11 while the teeth 36 are adapted to mesh withcorresponding teeth 38 on a fixed ring 39 secured to the transmissionhousing 3. 40 is a shifting fork engaging a recess 41 in the eccentricmember 24 and adapted to shift said member longitudinally upon theroller bearings 22 and 23 while maintaining at all times the engagementof the pinion 21 with said shaft having a reverse idler gear 55 ro--centric 31 and rotatable member 8 all rotate asa unit and form a directdrive.

In order to stop rotation of the eccentric 24 before the same isclutched to the ring 39, a braking mechanism is provided comprising thebrake shoe 42 extending radially inward of the transmission case. Thisbrake shoe is urged inwardly by the coil spring 43 and engages with thecam surface 44 on the shifting fork 40. This fork is allowed to rotateon its shaft so the clearance between 40 and 25 is taken up when theshifting fork 40 is moved rearwardly. Thus the brake shoe 42 engagingthe cam 44 stops the rotation of the eccentric 24 before engaging theclutch teeth 36 with the fixed clutch teeth 38.

The driven shaft 17 is splines 45 on which is slida ly mounted a s urgear 46 having external clutch teeth 46' t ereon adapted to engage theinternal clutch teeth 13 when the gear is in the forward position. 47 isthe shiftin fork engaging a recess 48 in the hub of the gear 46 andserving to move said gearlongitudinally on the splines. 49 is acountershaft parallel to the driven shaft 17 and having rotatablymounted thereon the spur gear 50 constantly meshing with the gear teeth12. 51 is another gear mounted on the countershaft and preferably formedintegral with the gear 50-,

this latter gear having the teeth 52adaptcdto mesh w th the teeth 53 onthe gear 46 when the latter is moved rearwardlyon the splines of thedriven shaft. provided'a stub shaft 54 in a bearing 54,

tatably mounted thereon adapted to simul taneously engage the gears 51and 46' when shifted into its forward position. For actuating thereverse idler gear thereis a shiftin fork 56 engaging the recess 57inthe hu of the idlergear.

In the transmission as described above, the units A and B are preferablycontrolled by separate shifting levers and by suitably arranging thelevers there are available six different speeds, four forward and two'reverse. The direct drive is obtained when the eccentric 24 is clutchedto the member 8, this being the forward portion ofthe eccentric with theexternal teethv37. engaging internal teeth 11. The ear 46 is also intheforward position, thus irectly connecting the membet- '8 with thedriven shaft 17 by the euprovided with There is also gagement ofinternal clutch teeth 13 with the externalclutch teeth 36.

The second speed of the transmission is obtained. by leaving the gear'46vdirectly coupled to the member 8- and moving the eccentricrearwardly todisengage the same from the clutch teeth 11 and couple it to the fixedring 39. With this arran ement a reduction is obtained by reason of t efact that the drive goes throughthe eccentric gear 31.

The third forward speed is obtained by shifting the gear 46 intoengagement with the gear 51, thus driving the driven shaft 17 by meansof the constant meshed gears 12 and 50 and the-change gears. 51 and 46.For the third speed the unit A again has the eccentric 24 coupled to themember 8 while for the fourth speed, the eccentrieis coupled to thefixed ring 39.

The reverse speeds are obtained by shifting a reverseidler gear intosimultaneous engagement with cars 46 and 51, thus rotating the driven saft 17 oppositely to the driving shaft 14. Two reverse gear ratios arepossible, one when the unit A is clutched in one position and the otherwhen said unit is arranged in the other position.

' What I claim as my invention is 1. A transmission comprising atransmissionv casing having a rotatable member centrally journaledtherein, a splined shaft journaled atone end within said rotatablemember and at the other end in said casing,

a second shaft in axial alignment with said nallyslidable to engage thegear on said main shaft and the gear on said countershaft, internal gearteeth on said rotatable member, vexternal gear teeth on said secondshaft, an eccentric rotatable on said second shaft, an eccentric gearjournaled on said eccentric and having internal and external gear teethadapted to mesh respectively with the gear on said second shaft and saidinternal ear, means for longitudinally shifting sai eccentric, clutchteeth on said eccentrio, clutch teeth on said transmission casingadapted to engage the teeth on said eccentric adapted to mesh with saideccentric gears- 2. A transmission comprising a transmission casing, arotatable member journaled in said casing havin internal 7 car teeth atone end thereof an clutch teet at the oppo site end thereof and beingformed integral with 'a constant mesh gear, asplined main and providedwith internal teeth meshing 5 able member, an eccentric rotatablymounted on said pinion shaft, an eccentric ar surrounding said pinionshaft and 30urna1ed on said eccentric, said eccentric ar bein providedwith external teeth m g wi the internal teeth on said rotatable memberwith the inion on said pinion shaft, means for longitudinally movingsaid eccentric, clutch teeth on said transmission casing engagable withsaid eccentric, and clutch teeth on said eccentric enga ble with saidinternal geari a countersfizft, a gear on said countersha t meshing withsaid constant mesh gear, a gear slidable on said main shaft and adaptedto alternatively engage the clutch teeth on said rotatable member andthe gear on said countershaft, and a reverse idler pinion longitudinallymovable to simultaneously eng c said gears on'said main rz aft.

shaft and counte In testimony whereof I aflix my signature.

SCHUYLEB a JEFFRIVES.

